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April, 26th. 2006:
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TIMEGM
Section: Linux Programmer's Manual (3)
Updated: 2007-07-26
Index
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NAME
timegm, timelocal - inverses of gmtime and localtime
SYNOPSIS
#include <time.h>
time_t timelocal(struct tm *tm);
time_t timegm(struct tm *tm);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
timelocal(),
timegm():
_BSD_SOURCE || _SVID_SOURCE
DESCRIPTION
The functions
timelocal()
and
timegm()
are the inverses of
localtime(3)
and
gmtime(3).
CONFORMING TO
These functions are nonstandard GNU extensions
that are also present on the BSDs.
Avoid their use; see NOTES.
NOTES
The
timelocal()
function is equivalent to the POSIX standard function
mktime(3).
There is no reason to ever use it.
For a portable version of
timegm(),
set the
TZ
environment variable to UTC, call
mktime(3)
and restore the value of
TZ.
Something like
#include <time.h>
#include <stdlib.h>
time_t
my_timegm(struct tm *tm)
{
time_t ret;
char *tz;
tz = getenv("TZ");
setenv("TZ", "", 1);
tzset();
ret = mktime(tm);
if (tz)
setenv("TZ", tz, 1);
else
unsetenv("TZ");
tzset();
return ret;
}
SEE ALSO
gmtime(3),
localtime(3),
mktime(3),
tzset(3)
COLOPHON
This page is part of release 3.27 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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